Table I.
Demographic characteristics at first cycle for women and men enrolled in the Environment and Reproductive Health Study (EARTH)—median (IQR) or n (%).
| Women (n = 481) | Men (n = 249) | |
|---|---|---|
| Age (years) | 35 (32, 38) | 36 (33, 40) |
| missing | 0 | 1 |
| BMI (kg/m2) | 23.4 (21.2, 26.4) | 26.9 (24.3, 29.5) |
| missing | 2 | 1 |
| Race | ||
| White | 400 (83.2) | 218 (87.9) |
| Black/African American | 13 (2.70) | 6 (2.42) |
| Asian | 45 (9.36) | 15 (6.05) |
| Other | 23 (4.78) | 9 (3.63) |
| missing | 0 | 1 |
| Education | ||
| <College graduate | 39 (9.03) | 34 (16.8) |
| ≥College graduate | 393 (91.0) | 168 (83.2) |
| missing | 49 | 47 |
| Smoking status | ||
| Never | 350 (72.8) | 167 (67.3) |
| Current | 13 (2.70) | 17 (6.85) |
| Former | 118 (24.5) | 64 (25.8) |
| missing | 0 | 1 |
| Primary infertility diagnosis at study entry | ||
| Female factor | ||
| Diminished ovarian reserve | 42 (8.73) | 18 (7.23) |
| Ovulation disorders | 55 (11.4) | 30 (12.1) |
| Endometriosis | 29 (6.03) | 13 (5.22) |
| Uterine disorders | 5 (1.04) | 2 (0.80) |
| Tubal factor | 28 (5.82) | 19 (7.63) |
| Male factor | 137 (28.5) | 77 (30.9) |
| Unexplained | 185 (38.5) | 90 (36.1) |
Abbreviations: body mass index (BMI); interquartile range (IQR).